Deadcode removal improvement
Deadcode removal in Obc : - suppression of switch unused cases : switch(true) { case false: ... } - activation with -deadcode option
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2 changed files with 45 additions and 15 deletions
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@ -45,7 +45,8 @@ let compile_program p =
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(*Dead code removal*)
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let p = pass "Dead code removal"
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(!do_mem_alloc || !do_linear_typing) Deadcode.program p pp in
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(!do_mem_alloc || !do_linear_typing || !deadcode)
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Deadcode.program p pp in
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(*Control optimization*)
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let p = pass "Control optimization" true Control.program p pp in
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@ -28,23 +28,52 @@
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(***********************************************************************)
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open Obc
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open Obc_mapfold
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let is_deadcode = function
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| Aassgn (lhs, e) -> (* remove x=x equations *)
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(match e.e_desc with
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| Eextvalue w -> Obc_compare.compare_lhs_extvalue lhs w = 0
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| _ -> false
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)
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| Acase (_, []) -> true
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| Afor(_, _, _, { b_body = [] }) -> true
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| _ -> false
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open Types
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open Initial
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let act funs act_list a =
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let a, _ = Obc_mapfold.act funs [] a in
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if is_deadcode a then
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a, act_list
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else
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a, a::act_list
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match a with
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| Aassgn (lhs, e) -> (* remove x=x equations *)
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(match e.e_desc with
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| Eextvalue w when (Obc_compare.compare_lhs_extvalue lhs w = 0)
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-> a, act_list (* removal of action *)
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| _ -> a, a :: act_list
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)
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| Acase (_, []) -> a, act_list (* removal *)
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| Acase ({e_desc =
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Eextvalue(
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{w_desc = Wconst ({se_desc = Sbool b})}
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)
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},
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c_b_l) ->
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let pb = if b then ptrue else pfalse in
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let c_b_l = List.filter (fun (c,b) -> c = pb) c_b_l in
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begin
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match c_b_l with
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[c,b] ->
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let a = Ablock b in
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a, a :: act_list
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| [] -> a, act_list
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| _ -> assert false (* More than one case after filter *)
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end
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| Acase ({e_desc =
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Eextvalue(
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{w_desc = Wconst ({se_desc = Sconstructor ce})}
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)
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},
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c_b_l) ->
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let c_b_l = List.filter (fun (c,b) -> c = ce) c_b_l in
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begin
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match c_b_l with
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[c,b] ->
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let a = Ablock b in
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a, a :: act_list
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| [] -> a, act_list
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| _ -> assert false (* More than one case after filter *)
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end
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| Afor(_, _, _, { b_body = [] }) -> a, act_list (* removal *)
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| _ -> a, a :: act_list
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let block funs acc b =
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let _, act_list = Obc_mapfold.block funs [] b in
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